You mean like to third party?
Seems to happen as soon as a couple dines with another couple - suddenly no rules apply. Strangely it is more about the funny or even embarrassing moments than the seventh heaven occurrences.
In Europe (Not England or Ireland, but Scotland too) I found that guys are way more open about issues they have a hard time with when talking about sex and sex life with their male friends. The bravados are not mentioned, guys rarely go into detail, they talk about the "pick up" but not what goes on after.
I like to talk about sex but not talk about my sex life. Weird, uh?